TrueSatan writes: Some, rare, individuals have almost perfect recall of events form their own lives while having only normal memory of less personal events. A well-known example of such a person is the actress Marilu Henner.

Brain scans have shown significant differences between the brains of these individuals and the norm...differences that are often linked to obsessive/compulsive disorders. A number of the individuals (certainly the majority and, arguably, all) in question do suffer from such disorders though not to such a degree as to significantly impair day to day life.

The research into these cases may lead to a better understanding of how memory works.